Read socket is blocked - tcl

Question

I'm writing a socket utility to communicate a client to a server. When input to the socket from the client side, the server is receiving it fine. However, when input to the socket from the server, the client can't read. When checking for fblocked $channel. It is 1. I've tried everything including adding new line, ...
Please help.
Below is my code
proc read_command { sock } {
variable self
global connected
set len [gets $sock line]
set bl [fblocked $sock]
puts "Characters Read: $len Fblocked: $bl"
if {$len < 0} {
if {$bl} {
puts "Input is blocked"
} else {
set connected 1
puts "The socket was closed - closing my end"
close $sock
}
} else {
if {!$bl} {
puts "Read $len characters: $line"
catch {uplevel #0 $line} output
puts "1==>$output<=="
puts $sock "$output"
puts $sock "\n"
flush $sock
}
}
}
proc client { host port } {
variable self
set s [socket $host $port]
set self(csock) $s
set self($s,addr) $host
set self($s,port) $port
fconfigure $s -buffering line -blocking 0
return $s
}
proc prun { sock args} {
variable self
set result [list]
set cmd $args
set cmd [regsub -all {(^\s*\{)||(\}\s*$)} $cmd ""]
set cmd [string trimleft $cmd]
set o1 [eval $cmd]
#catch {uplevel #0 $cmd} o1
puts "1_$sock ==> $o1"
lappend result $o1
#--------------
puts $sock $cmd
flush $sock
set bl [fblocked $sock]
set file [read $sock]
set bl [fblocked $sock]
puts "Fblocked: $bl"
puts "Output: $file"
puts "2_$Comm::self(csock) ==> $file ==> $bl"
lappend result $file
return $result
}
Here is how I run it.
I call server on 1 of the terminal. It will echo the ip address and the port.
Then I call client using the address and the port above to get back the client socket
Then I call prun on the client shell to get back a pair of values, one with the value of the cmd call on the client, and the other the value of the cmd call on the server. Basically I would like to get the pair of values so I can use them for correlation between the 2 set of data.
Below is the code:
1.
On server shell
$ server
2.
On client shell
$ set s [client $addr $port]
3.
Call a proc to get the value from the client shell, then send the command to the server to get the value from the server shell, and return that value back to the client.
$ set res [prun $s {set val [get_attribute [get_nets mynet] pin_capacitance_max]}]

Answer 1

You wrote:
puts "2_$Comm::self(csock) ==> $file ==> $bl"
and defined self with variable. Are you working with packages?. May be you forgot something related to it.
For test you can use just global but using arrays would be a little more complicated.